Classification Of DTH Drill Rigs
It is divided into two categories: rock drills and drilling rigs, and drilling rigs are divided into open-pit drilling rigs and downhole drilling rigs.
Rock Drill
It is used to drill gun holes with a diameter of 20~100 mm and a depth of less than 20 meters in the rock above medium hard. According to its different power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, of which wind rock drills are the most widely used.
Surface drills
According to the different working mechanisms of crushing ore, it is divided into steel rope impact drilling rig, DTH drilling rig, tooth wheel drilling rig and rotary drilling rig. Steel rope impact drilling rigs have been gradually replaced by other drilling rigs due to low efficiency. DTH drilling rig with drill pipe to drive the wind impactor and drill bit to rotate together, using the piston impact of the wind impactor to crush ore, usually used in small and medium-sized mines to drill 80~250 mm diameter gun holes. Tooth wheel drilling rig with the rolling action of the tooth wheel drill bit to crush ore rock, suitable for drilling holes with a diameter of 150~440 mm on hard ore, it has the advantages of high efficiency and low labor intensity, and is widely used in large and medium-sized open-pit metal mines. A DTH (or toothwheel) drilling rig consists of an impactor (or drill bit), a slewing mechanism, a lifting mechanism, a pressurizing device, a traveling mechanism, a slag discharge system, a drill frame and a drill pipe. Rotary rigs are only suitable for drilling softer ore and coal.
Downhole drilling rigs
When drilling a downhole hole with a hole diameter of less than 150 mm, in addition to the application of rock drill, small diameter DTH drilling of 80~150 mm can also be applied. When drilling gun holes with a diameter of less than 70 mm in coal or softer ore, generally using power drills or wind drills, the drill pipe is driven by an electric motor (or air motor), and the drilled rock (coal) chips are discharged through the spiral groove on the drill pipe.
